Electric transmission of intelligence.



I. KITSEE. ELECTRIC TRANSMISSION OF INTELLIGENCE.

APPLIGATION FILED MAR. s, 1906. RENEWED JUNE 5, 1912.

1X) i l mes ma 5140mm K/QQWZWM Q5Q 6SS Patented Jan. 14, 1913.

"UNITED STATES PATENT OFFICE.

ISIDOR KITSEE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR 0F ONE-HALF TO WILLIAM J. LATTA, 0F PHILADELPHIA, PENNSYLVANIA.

ELECTRIC TRANSMISSION OF INTELLIGENCE.

Specification of Letters Patent.

Patented Jan. 14, 1913.

Application filed March 3, 1906, Serial No. 304,032. Renewed June 5, 1312. Serial No. 701,911.

To all whom it may concern Be it known that I, ISIDOR Krrsnn, citizen of the United States,-residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful "Improvements in Electric Transmission 'of Intelligence, of which the following is a specification.

My invention relates to an improvement in electric transmission of intelligence and has more special reference to an arrangement whereby telegraphic and" telephonic messages may be transmitted simultaneously over one circuit.

In another applicationfor which Letters Patent were granted to me in the United States'October 31st, 1905., No. 803,110, I have described a method whereby telephonic mes sages may be transmitted inductively from one station to a second station.

In my experiments I have found that it is possible to telegraph over suchylines with the aid of true reversals and that simultaneous telegraphing and telephoning is practical over these lines.

In the drawing which illustrates in diagrammatic view my invent-ion, I have shown the preferred arrangement to obtain the necessary results. In this draw-ing, the line of transmission consists of two pairs of wires, the wires of each pair related inductively as to each other and two stations, operatively connected to said 'line of transmission, one pair of wires embraces the wires A and B, and the second pair of wires embraces the wires C and D. The wire A is connected with its terminal 17 to the left hand station; its terminal 37 remaining free and unconnected at the right hand station. The terminal 38 of wire B is connected to the right hand station and the .other terminal 18 is left free and unconnected at the left hand station. Of the second pair, the terminal 39, of Wire C is connected to the right hand station and its terminal 19 left'free at the left.

is also provided with a telegraphic receiving in said shunt, and a transmitting key for said shunt; the transmitting key embracing the stationary point Y14 and the lever 15. The receiving device embraces the polarized relay l1 and the condensers 6. These condensers are connected in shunt to'said polarized relay and are provided with the switch 10, with the aid of which the telephonic receiver 1 may be shunted at the will of the operator. The polarized relay 11 is provided with means 5 to relay the trans mitted impulses to a local circuit. In this drawing, I have only shown the wires adapted to be connected to saidlocal circuit.

In a system wherein the lines of transmission are inductively related to each other, as is illustrated in the accompanying drawing, the transmitted impulses will flow O\ er the circuit as follows: It is supposed that the telegraph operator at the left hand station transmits a message and that the same message is to be received by the operator at the right hand station.

the impulses to be transmitted. Normally, that is, when the key is open, an impulse will flow over the line from the battery 13, because this battery is of higher E. M. F. than the battery 12; but when the key is closed, the battery 13 is short circuited and The tral'lsmitting v operator closes the key in accordance with ing station, the polarized receiving relay and will return through induction by the other conductors. The same holds good for telephonic impulses. When through the operation of the microphonic diaphragm 2, impulses are generated in the secondary 4:,

these impulses flowing over the conductor 17, will induce impulses in 18 and these impulses will be received by the telephonic receiver 1 on the right hand side.

In experiments made,'in lines of about fifty miles,-it was found, that when the relay is shunted by condensers of small capacity (I have used three condensers in series, each of of a M. F.) a telephonic receiver inserted between these condensers will receive the telephonic messages clear and distinct; the telegraphic impulses not I interfering with the transmitted speech.

and adapted tozimpress upon said line impulses" of opposite polarity and embracing a telephonic transmitter; the receiving organism embracing for each station a polarized relay, a series of condensers in shunt to said relay and a telephonic receiver in series with said condensers.

2. A system for electrically transmitting intelligence comprising at least two stations connected inductively together through lines of transmission, each station comprising a telegraphic transmitter and a telephonic transmitter, and comprising as a telegraphic receiver a polarized relay 'and as a telephonic rcceiver a series of condensers in shunt to said relay, anda telephonic receiver in series to said condensers.

3. In combination with a line of transmission, means to sinniltaneously telegraph and telephone, said means comprising for the telegraph means to impress upon said line alternatingimpulses of opposite polarity and a polarized-relay as receiver, and comprising for the telephone a microphonic transmitter, source of current and induc- 'torium, the primary conne t. d to said source of current, the secondary connected to the line and comprising condenser and telephonic receiver connected in shunt as to the telegraphic receiver as the means to receive the telephonic impulses.

In testimony whereof I aifix my signature in presence of two witnesses.

ISIDOR KITSEE. Witnesses:

MARY C. SMITH, ALVAH RITIENHOUSE. 

